A look inside of a large sinkhole on highway 24 at mile marker 165 between Red Cliff and Leadville Friday morning, July 13th, 2012. Crew from the Colorado Department of Transportation were on hand surveying the sinkhole which opened up Monday. The sinkhole, developed above a century-old Rio Grand Railway tunnel that measures 25×20 feet and approximately 50-60 feet deep. CDOT plans to put out the construction contract right away to begin repairs ASAP. Andy Cross, The Denver Post